| 摘要 |
<p>A driving arrangement for a plurality of light emitting diodes (LEDs), comprising a first power supply line (Vcc) and a set of signal lines (1a, 1b, 1c) for carrying brightness intensity and or chromatic information for the plurality of light emitting diodes (54), includes:
- a second power supply line (GND) to provide jointly with the first power supply line (Vcc) a two-wire power supply, and
- a switching block (47) to generate switching signals to provide brightness intensity and/or chromatic information the light emitting diodes (54) via the signal lines (1a, 1b, 1c). In a first possible configuration of use, the first (Vcc) and second (GND) power supply line jointly supply power to a processor (52) included in an "active" lighting source wherein the processor drives the light emitting diodes (54) as a function of the brightness intensity information provided to the processor via the signal lines (1a, 1b, 1c). In a second possible configuration of use, adopted for driving "passive" sources, the second power supply line (GND) is not used, and the brightness of the light emitting diodes (54) in the source is controlled by switching signals applied thereto via the first power supply line (Vcc) and the set of signal lines (1a, 1b, 1c).</p> |
